Yeah, or run fsck if you can't find the OSX discs. It most likely won't be a long-term problem. If this is a laptop then it's quite common for the file system to get a bit messed up from all the bumping and jerking you do 'round the thing (read into that as you will). Back everything up, but you'll probably be fine.

Well I'm concerned that even if Utility fixes it, that it was a physical problem or some sort. I mean, was data written to the HD in some really bad way, or did I physically knock the HD? I do feel better now, but I'm going to be careful about backing up over the next month.

I mean, was data written to the HD in some really bad way, or did I physically knock the HD?

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Possibly the latter which could lead to the former although not necessarily. Really, I doubt it's anything to worry about. If you have trouble getting it fixed then you've got a problem, but otherwise it's actually quite a common occurrence.

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